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/*
* Copyright 2018 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef __CHIP_G_ITE_SYNC_H
#define __CHIP_G_ITE_SYNC_H
#include "util.h"
/*
* Assembler function to generates ITE EC sync sequence, which requires two
* lines generating phase locked 200 KHz and 100 KHz clocks. This is achieved
* by directly togging two GPIOs.
*
* gpio_addr: address of the register to write to drive the GPIOs
* both_zero:
* one_zero:
* zero_one:
* both_one: values to write at gpio_addr to set the tow lines to these
* stattes
* half_period_ticks: number of interations of the tight loop to last for half
* the period of the higher frequency
* total_ticks_required: total ticks required to generate the sequence of the
* necessary duration.
*/
void ite_sync(volatile uint16_t *gpio_addr, uint16_t both_zero,
uint16_t one_zero, uint16_t zero_one, uint16_t both_one,
uint32_t half_period_ticks, uint32_t total_ticks_required);
/* Generate ITE SYNC sequence on the I2C interface controlling the EC. */
void generate_ite_sync(void);
#endif
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